$-\frac{2}{x^3}+\frac{3}{x^2}-4x$
$dy=y\left(2+\sin\left(x\right)\right)dx$
$x^2-5x^2-x+16$
$\left(-2^x+y\right)\left(-2^x-y\right).$
$x^2y-3xy^2$
$sec\left(2x\right)-cos\left(2x\right)$
$\int\left(x+2\right)sqrt\left(4x+x^2\right)\:dx$
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